ants.cpp: In function 'int main()': ants.cpp:26: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result ants.cpp:29: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result ants.cpp: In function 'void cb()': ants.cpp:43: warning: unused variable 'i' ants.cpp: In function 'bool ver(int)': ants.cpp:91: warning: 'nev' may be used uninitialized in this function